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Ienv

Ienvp

Recognizer for ienv structures.

Signature
(ienvp x) → *

Definitions and Theorems

Function: ienvp

(defun ienvp (x)
 (declare (xargs :guard t))
 (let ((__function__ 'ienvp))
  (declare (ignorable __function__))
  (and
    (consp x)
    (eq (car x) :ienv)
    (mbe :logic (and (alistp (cdr x))
                     (equal (strip-cars (cdr x))
                            '(uchar-format schar-format)))
         :exec (fty::alist-with-carsp (cdr x)
                                      '(uchar-format schar-format)))
    (b* ((uchar-format (cdr (std::da-nth 0 (cdr x))))
         (schar-format (cdr (std::da-nth 1 (cdr x)))))
      (and (uchar-formatp uchar-format)
           (schar-formatp schar-format))))))

Theorem: consp-when-ienvp

(defthm consp-when-ienvp
  (implies (ienvp x) (consp x))
  :rule-classes :compound-recognizer)